package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
//检查用户是否完成登录
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {


        HttpServletResponse response = (HttpServletResponse)servletResponse;
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        //1.获取本次请求的url
        String requestURI = request.getRequestURI();
        log.info("接受到请求： {}",request.getRequestURI());
        //定义不需要处理的请求路径
        String []urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",//移动端发送短信
                "/user/login"//移动端登录
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.不需要处理则放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1.判断登录状态，如果已经登录，则放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id: {}",request.getSession().getAttribute("employee"));
            Long empid = (Long)request.getSession().getAttribute("employee");
            BaseContext.SetCurrentId(empid);
            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断登录状态，如果已经登录，则放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id: {}",request.getSession().getAttribute("user"));
            Long userpid = (Long)request.getSession().getAttribute("user");
            BaseContext.SetCurrentId(userpid);
            filterChain.doFilter(request,response);
            return;
        }
        

        //5.如果未登录，则返回未登录结果，通过输出流方式向客户端响应数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

        return;
    }
    //路径匹配，检查当前请求是否需要放行
    public boolean check(String[] urls,String requestUrl){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestUrl);
            if(match){
                return true;
            }
        }
        return false;
    }

}
